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| author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-09-25 16:41:02 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2012-09-25 16:41:02 +0400 |
| commit | ac48f6cb5f268daff06b636444819e5ffb462611 (patch) | |
| tree | 56bcc8b2de42738764ac65056067a17cb97609f4 /include/linux/kref.h | |
| parent | e64d07a2dae569fc3c938adac777562a1d6f151e (diff) | |
| parent | 5698bd757d55b1bb87edd1a9744ab09c142abfc2 (diff) | |
| download | linux-ac48f6cb5f268daff06b636444819e5ffb462611.tar.xz | |
Merge tag 'v3.6-rc6' into spi-mxs
Linux 3.6-rc6
Conflicts (overlap between moving code that accesses registers around
and factoring the register access out into a SSP layer):
drivers/mmc/host/mxs-mmc.c
Diffstat (limited to 'include/linux/kref.h')
| -rw-r--r-- | include/linux/kref.h | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/include/linux/kref.h b/include/linux/kref.h index 9c07dcebded7..65af6887872f 100644 --- a/include/linux/kref.h +++ b/include/linux/kref.h @@ -18,6 +18,7 @@ #include <linux/bug.h> #include <linux/atomic.h> #include <linux/kernel.h> +#include <linux/mutex.h> struct kref { atomic_t refcount; @@ -93,4 +94,21 @@ static inline int kref_put(struct kref *kref, void (*release)(struct kref *kref) { return kref_sub(kref, 1, release); } + +static inline int kref_put_mutex(struct kref *kref, + void (*release)(struct kref *kref), + struct mutex *lock) +{ + WARN_ON(release == NULL); + if (unlikely(!atomic_add_unless(&kref->refcount, -1, 1))) { + mutex_lock(lock); + if (unlikely(!atomic_dec_and_test(&kref->refcount))) { + mutex_unlock(lock); + return 0; + } + release(kref); + return 1; + } + return 0; +} #endif /* _KREF_H_ */ |